[Cashtab] [xecjs-message upgrade p3/3] Remove debug logging and tests

Summary:
T2783

Depends on D12646

Remove debug logging from xecjs-message and remove async test from Cashtab. Published xecjs-message as this version and installed in Cashtab.

Test Plan:
npm start
Sign and verify msgs, no test output in dev console

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12647